sw64: deliver a warm/cold reset to Root Complex with plugin JMicron 585 card

Sunway inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I5GFPA

--------------------------------

On SW64 platform, JMicron 585 SATA card directly connected to Root
Complex may raise DMA failure when reboot, so we force a warm/cold reset
to Root Complex to fix can not access JMicron 585 SATA card.
Signed-off-by: NDai Xin <daixin@wxiat.com>
Reviewed-by: NHe Sheng <hesheng@wxiat.com>
Signed-off-by: NGu Zitao <guzitao@wxiat.com>

arch/sw_64/include/asm/platform.h

@@ -23,5 +23,6 @@ extern void (*pm_restart)(void);
 extern void (*pm_halt)(void);
 extern int i2c_set_adapter(void);
 extern void cpld_write(uint8_t slave_addr, uint8_t reg, uint8_t data);
+extern void fix_jm585_reset(void);
 
 #endif /* _ASM_SW64_PLATFORM_H */

arch/sw_64/kernel/reset.c

@@ -15,7 +15,27 @@
 
 #include <acpi/reboot.h>
 #include <asm/idle.h>
+#include <asm/sw64io.h>
 
+void fix_jm585_reset(void)
+{
+	struct pci_dev *pdev;
+	struct pci_controller *hose;
+	int val;
+
+	pdev = pci_get_device(PCI_VENDOR_ID_JMICRON,
+				0x0585, NULL);
+	if (pdev) {
+		hose = (struct pci_controller *)pdev->sysdata;
+		val = read_rc_conf(hose->node, hose->index,
+				RC_PORT_LINK_CTL);
+		write_rc_conf(hose->node, hose->index,
+				RC_PORT_LINK_CTL, val | 0x8);
+		write_rc_conf(hose->node, hose->index,
+		RC_PORT_LINK_CTL, val);
+	}
+
+}
 static void default_halt(void)
 {
 	local_irq_disable();
@@ -42,6 +62,7 @@ static void default_restart(void)
 	/* No point in taking interrupts anymore. */
 	local_irq_disable();
 
+	fix_jm585_reset();
 #ifdef CONFIG_EFI
 	if (efi_capsule_pending(NULL))
 		efi_reboot(REBOOT_WARM, NULL);

drivers/platform/sw64/legacy_xuelang.c

@@ -42,22 +42,8 @@ void sw64_poweroff(void)
 
 void sw64_restart(void)
 {
-	struct pci_dev *pdev;
-	struct pci_controller *hose;
-	int val;
-
 	if (is_in_host()) {
-		pdev = pci_get_device(PCI_VENDOR_ID_JMICRON,
-					0x0585, NULL);
-		if (pdev) {
-			hose = (struct pci_controller *)pdev->sysdata;
-			val = read_rc_conf(hose->node, hose->index,
-					RC_PORT_LINK_CTL);
-			write_rc_conf(hose->node, hose->index,
-					RC_PORT_LINK_CTL, val | 0x8);
-			write_rc_conf(hose->node, hose->index,
-					RC_PORT_LINK_CTL, val);
-		}
+		fix_jm585_reset();
 		cpld_write(0x64, 0x00, 0xc3);
 	} else
 		vt_mode_kill_arch(LINUX_REBOOT_CMD_RESTART);